title: Tuning the competition between ferromagnetism and antiferromagnetism in a half-doped manganite through magnetoelectric coupling.
abstract: We investigate the possibility of controlling the magnetic phase transition of the heterointerface between a half-doped manganite La(0.5)Ca(0.5)MnO(3) and a multiferroic BiFeO(3) (BFO) through magnetoelectric coupling. Using macroscopic magnetometry and element-selective x-ray magnetic circular dichroism at the Mn and Fe L edges, we discover that the ferroelectric polarization of BFO controls simultaneously the magnetization of BFO and La(0.5)Ca(0.5)MnO(3) (LCMO). X-ray absorption spectra at the oxygen K edge and linear dichroism at the Mn L edge suggest that the interfacial coupling is mainly derived from the superexchange between Mn and Fe t(2g) spins. The combination of x-ray absorption spectroscopy and mean-field theory calculations reveals that the d-electron modulation of Mn cations changes the magnetic coupling in LCMO, which controls the enhanced canted moments of interfacial BFO via the interfacial coupling. Our results demonstrate that the competition between ferromagnetic and antiferromagnetic instability can be modulated by an electric field at the heterointerface, providing another pathway for the electrical field control of magnetism.
authors.affiliation: Department of Materials Science and Engineering and Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: Di
authors.initials: D
authors.lastname: Yi
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
authors.forename: Satoshi
authors.initials: S
authors.lastname: Okamoto
authors.forename: Suresha
authors.initials: S
authors.lastname: Jagannatha
authors.forename: Yi-Chun
authors.initials: YC
authors.lastname: Chen
authors.forename: Pu
authors.initials: P
authors.lastname: Yu
authors.forename: Ying-Hao
authors.initials: YH
authors.lastname: Chu
authors.forename: Elke
authors.initials: E
authors.lastname: Arenholz
authors.forename: R
authors.initials: R
authors.lastname: Ramesh